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    <script>
      const num1 = ((1 + 1 - 4) * 5) / 2;
      console.log(num1);

      const num2 = 9 % 2; // 返回余数 取余
      console.log(num2);

      const num3 = 2 ** 3; //2的3次方
      console.log(num3);
    </script>
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